.编解码应用 {
  margin: 0 auto;
  width: min(1200px, 92vw);
  padding: 100px 0 120px;
}

.编解码应用 > h1 {
  font-size: 2rem;
  margin-bottom: 20px;
  color: #9ab;
}

.工具页签 {
  display: flex;
  gap: 8px;
  margin: 8px 0 20px;
}

.工具页签 .页签按钮 {
  padding: 8px 14px;
  border: 1px solid #ffffff2a;
  background: #0f1113;
  color: #c8d3e0;
  border-radius: 6px;
}

.工具页签 .页签按钮.active {
  background: #192027;
  border-color: #7aa2f7aa;
  color: #dbe6f3;
}

.面板 {
  display: none;
}
.面板.active {
  display: block;
}

.面板行 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.面板列 {
  background: #0f1113;
  border: 1px solid #ffffff20;
  border-radius: 10px;
  padding: 16px;
}

.面板标题栏 {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.面板标题栏 h2 {
  font-size: 1.1rem;
  color: #9ab;
}

.操作区 {
  display: flex;
  gap: 8px;
}

.操作区 > button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 30px;
  padding: 0 10px;
  border-radius: 6px;
  border: 1px solid #2a3948;
  background: linear-gradient(180deg, #1a232c, #141b22);
  color: #d2deec;
}

.操作区 > button:hover {
  border-color: #3d5368;
  filter: brightness(1.05);
}

.操作区 > button:active {
  transform: translateY(1px);
}

textarea {
  width: 100%;
  min-height: 220px;
  background: #0b0d0f;
  border: 1px solid #ffffff14;
  color: #d7e2ef;
  border-radius: 8px;
  padding: 10px 12px;
  resize: vertical;
}

.选项区 {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 8px 0;
  color: #aab7c5;
}

.按钮行 {
  display: flex;
  gap: 10px;
  margin-top: 10px;
}

button.主按钮 {
  background: #2b5fd9;
  color: #fff;
  border: 1px solid #2b5fd9;
  padding: 8px 14px;
  border-radius: 8px;
}

button.次按钮 {
  background: #1a232c;
  color: #c8d3e0;
  border: 1px solid #314152;
  padding: 8px 14px;
  border-radius: 8px;
}

.链接按钮 {
  background: transparent;
  color: #7aa2f7;
  text-decoration: underline;
}

.拖拽区 {
  display: grid;
  place-content: center;
  text-align: center;
  border: 1px dashed #2a3a4a;
  color: #9ab;
  border-radius: 10px;
  min-height: 120px;
  padding: 12px;
  background: #0b0f14;
}

.拖拽区.dragover {
  background: #122030;
  border-color: #7aa2f7;
}

.提示文本 {
  color: #7f8b99;
  font-size: 0.9rem;
}

.预览区 {
  margin-top: 10px;
  display: grid;
  place-content: center;
  background: #0b0d0f;
  border: 1px solid #ffffff14;
  border-radius: 8px;
  min-height: 220px;
}

.预览区 img {
  max-width: 100%;
  max-height: 360px;
  object-fit: contain;
}

.元信息 {
  margin-top: 8px;
  color: #8fa3b8;
  font-size: 0.9rem;
}

@media (max-width: 900px) {
  .面板行 {
    grid-template-columns: 1fr;
  }
}